#include <stdio.h>
#include <stdlib.h>

int main()
{
    float a,b,c;
    char op;
    scanf("%f%c%f",&a,&op,&b);
    switch(op)
    {
    case'+':
        c=a+b;
        break;
    case'-':
        c=a-b;
        break;
    case'*':
        c=a*b;
        break;
    case'/':
        c=a/b;
        break;
    default:
        printf("error");
        return 0;
    }
    printf("result=%.2f",c);

}
